No, not only binder. Between individual particles act electrostatic forces, which they contract. The finer the particles, the solid hold together. Particles of size > 10 microns keep weak together; with a size of about 1 micron keep already well together (such powders tend to agglomeration) and particles < 0,1 micron stick together so firmly that you do not need for the binder. These are, for example, clay particles, which themselves act as a binder for coarse ceramic particles.
to be more specific clay particles in water interact through local positive (on platelets edges) and negative charges (so called card house structure) and in addition there are also van der Waals forces. In practice you need a certain degree of flocculation to give strength.
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